Fixed #147 "Please add symbol name to "can't find symbol" error message".

Fixed #147 "Please add symbol name to "can't find symbol" error message".

As suggested by sirzooro:
    Please add symbol name to "can't find symbol" error message,
    it would allow to quickly spot what is wrong. Now we have to
    position cursor at given row and column to find that name.

Also tweaked error reporitng function to append "..." at the end
of the message if it didn't fit into buffer.